Showing papers in "Journal of Molecular Spectroscopy in 1999"

TL;DR: The new spectroscopic technique of photoassociative spectra of ultracold atoms is reviewed, with an emphasis on connecting this area to traditional bound-state molecular spectroscopy.

TL;DR: The use of explicit mathematical models of is studied here as a means of determining near-equilibrium molecular structures from the zero-point moments of inertia of a range of isotopomers, and it is found that models with more than two parameters per axis generally give strongly correlated fits for the number of isotops typically available.

TL;DR: The present calculation produces results in significantly better agreement with experiment than previous determinations of the potential energy surface, and the energies predicted with the new surface are sufficiently accurate to be useful for the assignment of new high-resolution spectra.

TL;DR: In this paper, a new way of representing vibration-rotation term values for multiple isotopomers of a given electronic state of a diatomic molecule is presented which resolves problems associated with the way the conventional combined isotopomer expansion represents the atomic mass-dependent JWKB and Born-Oppenheimer breakdown correction terms.

TL;DR: In this article, line positions and line intensities of the infrared system ν 1, ν 3, and 2ν 4 bands of 14 NH 3 were analyzed using line positions from 0.0054 cm −1 apodized resolution FT spectra recorded at Orsay and using line intensity from 0.011 cm − 1 unapodizedresolution FT spectras recorded at Kitt Peak National Observatory.

TL;DR: In this paper, a Fourier transform spectrometer was used to obtain line positions and strengths of over 6000 transitions of HDO and D(sub 2)O with path lengths up to 433m.

TL;DR: The infrared spectrum of H3O+ in positive column discharges of H2/O2 gas mixtures has been studied by a difference frequency laser spectrometer and assignment of the nu3 fundamental band was extended to higher J, K transitions, which do not fit to the calculated pattern well but have definitely been assigned by using the ground state combination differences and relative intensities.

TL;DR: The fitted potential and Born-Oppenheimer breakdown functions are shown to be in good agreement with the results of ab initio calculations and are used to obtain high-order centrifugal distortion constants as well as level widths for quasi-bound levels.

TL;DR: In this paper, a new spectroscopic investigation on the X(1)Sigma(+) electronic ground state of the RbCs molecule is reported by using laser-induced fluorescence combined with Fourier transform spectroscopy (LIF-FTS).

TL;DR: Extensive new high-temperature, high-resolution FTIR emission spectroscopy measurements for the five common isotopomers of GeO are combined with previous diode laser and microwave measurements in combined isotopomer analyses.

TL;DR: The line positions and strengths of N(2)O were measured from absorption spectra obtained at high spectral resolution (0.011 cm(-1)) in the region between 3515 and 7800 cm (-1) to report line frequencies and strength of several N( 2)O isotopes, a few of which are reported for the first time, to my knowledge.

TL;DR: It is shown that the anharmonic coupling between the vibrational states nu1 and nu3 has to be considered for a correct simulation of the Raman spectrum of H2O, using an improved spectrometer of very high sensitivity.

TL;DR: A new closed form expression for the Franck-Condon integrals for overlap between arbitrary multidimensional harmonic oscillators has been exactly derived by employing the generating functions method.

TL;DR: Spectroscopic constants for the excited electronic state are determined from data measured by Fourier transform microwave and millimeter-wave absorption spectroscopy in a pulsed supersonic slit-jet discharge source.

TL;DR: In this article, the authors compute adiabatic potential energy curves and electronic dipole transition moments for a number of triplet Σ and Π states of the hydrogen molecule in a wide range of internuclear distances.

TL;DR: The far-infrared spectrum of formamide (HCONH2) has been recorded at high resolution and over 9000 vibration-rotation lines assigned and molecular parameters from the rovibrational analyses of the unperturbed 12(1)0 out-of-plane vibration band have been obtained.

TL;DR: Perturbation-facilitated optical-optical double resonance (PFOODR) has been used to access the 2(3)Pig state of 7Li2 via the excitation scheme using two single-mode tunable lasers.

TL;DR: A development of the dipole moment and polarizability operators of octahedral molecules are presented, using a tensorial formalism analogous to the one developed for tetrahedral molecules, involved in the calculation of the intensities of rovibrational transitions as well as in the calculations of the Stark effect.

TL;DR: The rotational analysis in the ground vibrational state has been carried out for CH3D by using the ground state combination differences to determine 12 rotational parameters, which reproduce the observed combination differences within an accuracy of 1.0 x 10(-4) cm-1.

TL;DR: In this article, Kaledin et al. proposed a model to estimate the dissociation energies and ionization potential of all lanthanide monohalides, where Ln in Ba through Lu, and X in O, S, F, Cl, Br, or I, should vary with Ln atom in a simple linear manner.

TL;DR: These results are derived without reference to any certified gas standard, and it is suggested that optical spectroscopy satisfies the criteria of a primary method set up by the Consultative Committee for Quantity of Matter (CCQM).

TL;DR: In this article, high-resolution spectra of gas mixtures of HDO, D2O, and H2O were obtained with a Fourier-transform spectrometer with path lengths up to 433 m.

TL;DR: In this paper, the (0, 0), (1, 0, (2, 0) and (4, 0)-bands of the C 3 Δ-X 3 Δ transition of TiS, between 743-863 nm, were studied using the technique of laser vaporization/reaction with supersonic cooling and laser-induced fluorescence (LIF) spectroscopy.

TL;DR: A comprehensive reinvestigation of the rotational spectrum of pyrimidine was carried out by using several different spectrometers, and complete rs and r0 heavy atom geometries have been determined.

TL;DR: Combined with already published data sets on H2O, the line position analysis yielded rotational energy levels for many of these states, but only the results relevant to the ground and the (010) states are presented here.

TL;DR: In this article, a laser excitation spectrum of the (0, 0) and (1, 1) bands of the CaF A(2)Pi-X (2)Sigma(+) system was recorded.

TL;DR: High-resolution spectra of H216O were recorded with a Fourier-transform spectrometer covering transitions in the (020), (100), and (001)-(010) bands to provide a more accurate representation of the parameters than those available at present for the six bands.

TL;DR: High-resolution lineshapes of the HF P(3) and P(6) transitions (2-0 band) have been recorded in a 14.9-cm long absorption cell using a pair of (InGaAsP)-distributed feedback diode lasers operating near 1.31 and 1.34 µm.

TL;DR: The UV spectrum of the 6(1)0 S1 <-- S0 vibronic transition of benzene, located at 259 nm, was recorded by means of a combination of a cw laser doubling unit and a molecular beam apparatus and general agreement with IR-band investigations was found.

TL;DR: High-resolution Fourier transform emission spectra of the à left and right arrow &Xtilde; transition of the jet-cooled p-xylyl radical in the 450-nm spectral region are obtained and the band contours of several vibronic bands are examined.